Solenoids
Fuellox supports the use of a Solenoid to control non electrical pumps.
This option is particularly beneficial when the Fuellox unit is installed with the following types of pumps:
- Diesel powered fire fighter (trash) pumps
- Petrol powered fire fighter (trash) pumps
- Pneumatic pumps
- PTO drive pumps
Solenoid Control
Motorised Pumps such as petrol or diesel. Use a Normally Closed, power to open spring return solenoid on the pipework outlet. Install the solenoid before the meter.
Air Pumps can be controlled using the solenoid on the pump air supply. See here for more on Pneumatic Pumps and Solenoids.
PTO Pumps Require a 2 position 3 way solenoid. See here for more on PTO Pumps and Solenoids.
Wiring Guide
How to Wire a Solenoid (with DIN Plug)
Follow these simple steps to correctly wire up a solenoid valve using a DIN plug.
1. Prepare the Cable
- Slide the nut, middle washer, and grommet onto the cable — in that order.
- Push the grommet down tight but leave a little room to work.
2. Strip and Measure the Wires
- Strip just enough insulation so the ends of each wire reach the plug terminals.
- Make the earth wire slightly longer — this ensures the earth stays connected if the cable is ever pulled.
3. Feed the Cable Through the Housing
- Insert the cable through the DIN plug housing.
- Twist the wire ends neatly to prepare them for connection.
4. Identify the Terminals
4.1 240V AC Solenoids
Most DIN plugs use the following layout:
| Terminal | Connection | Description |
|---|---|---|
| 1 | Active (Live) | Usually brown wire |
| 2 | Neutral | Usually blue wire |
| ⏚ | Earth (Ground) | Usually green/yellow wire |
4.1 12/24V DC Solenoids
DC Din plugs use the following layout
| Terminal | Connection | Description |
|---|---|---|
| 1 | Positive | Usually red wire |
| 2 | Ground | Usually black wire |
Note: Most solenoid coils are not polarity sensitive, but using this layout keeps wiring consistent and tidy.
4.3 Video guide
5. Connect the Wires
- Insert each wire into the correct terminal and tighten the screws securely.
- Check that no bare wire is exposed.
6. Assemble the Plug
- Slide the grommet and washer back up into place.
- Screw the nut down tight on the cable gland.
- Ensure the gland faces downward when installed — this prevents water ingress.
7. Final Assembly
- Fit the rubber seal and secure the top screw.
- Plug the connector onto the solenoid coil and tighten the retaining screw.
Pro Tip
If the cable feels loose or pulls out easily:
- Check that your grommet size matches the cable (6 mm suits most standard 3-core cables).
- Tighten the gland slightly with a spanner for a snug fit.
Return to Getting Started